a Faculty of Engineering, Muroran Institute of Technology, 27-1, Mizumoto-cho, Muroran-shi 050-8585, Japan b SPring-8, 1-1-1, Kouto, Mikazuki-cho, Sayo-gun, Hyougo 679-5198, Japan c IMSS, KEK, 1-1, Oho, Tsukuba-shi, Ibaraki 305-0801, Japan
Abstract:
By use of synchrotron radiation, powder X-ray diffraction of ScSb and YSb with a NaCl-type structure has been studied up to 45 GPa at room temperature. A first-order phase transition from the NaCl-type (B1) to a CsCl-type structure (B2) began to occur at around 28 GPa for ScSb and at around 26 GPa for YSb. Crystal data of the high-pressure phase of both antimonides are obtained. The high-pressure structural behavior of ScSb and YSb is similar to that of heavier LnSb (Ln=Dy-Lu). The B1-B2 transition for ScSb and YSb can be understood according to the rigid sphere model. The bulk moduli of ScSb and YSb are about 58 GPa at ambient pressure.